<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"xmlns:th="http://www.thymeleaf.org"
     xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
   <head>
       <title>Hello World!</title>
   </head>
   <body>
      <form method="POST" enctype="multipart/form-data" action="/upload"> 
          <p>文件：<input type="file" name="file"/></p>
          <p><input type="submit" value="上传" /></p>
      </form>
   </body>
</html>
